Title:
APPARATUS FOR FORMING SLIT IN BASE ROCK AND CONCRETE SURFACE
Document Type and Number:
WIPO Patent Application WO/1989/006741
Kind Code:
A1
Abstract:
An apparatus for forming a slit in a base rock and a concrete surface, constructed simply, capable of efficiently making a deep slit having a predetermined width and a smooth inner surface, and suppressing an increase, which would otherwise be caused by the replacing of bits, in the slit-making cost. This apparatus has a plate type bit (17) fixed to the front end of a laterally swingable plate (13), a drill bit (11) fixed to the front end of a rod (9a and/or 9b) extending rotatably and slidably along at least one side of this plate, and strikers (5 and/or 12a, 12b) for striking the plate and rod simultaneously or separately. The rod is provided at its front end portion with a stabilizer for stabilizing the direction of sliding. The plate type bit consists of a plurality of detachable bit blocks.
Inventors:
KATOH YUTAKA (JP)
Application Number:
PCT/JP1988/000643
Publication Date:
July 27, 1989
Filing Date:
June 27, 1988
Export Citation:
Assignee:
KOMATSU MFG CO LTD (JP)
International Classes:
E21B7/02; E21B7/00; E21B15/00; E21B19/08; E21C25/58; E21C27/00; E21C37/24; (IPC1-7): E21C11/00; E21C37/00
Foreign References:
| JPH03516826A | ||||
| JPH06195198A | 1994-07-15 |
Other References:
See also references of EP 0397858A1
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